Antenna for use with an automobile radioreceiver



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ANTENNA Fo USE WITH AN AUTOMOBILE RADIOREGEIVER P. L. MANN Filed July 11 Patented Aug. 21, 1934 f ANTENNA FOR USE WITH AN AUTOMOBIL RADIORJECEIVER Paul L. Mann, Chicago, Ill., assignor to Consolidated Wire and Associated Corporations, Chicago, Ill., a corporation of Illinois Application July 11, 1932, Serial No. 621,842

2 Claims. (Cl. Z50-33) UNITED STATES PATENT' OFFICE My invention relates in general to a radio antenna, and more in particular to an antenna for use with an automobile radio receiver.

In an automobile radio receiver installation, some difficulty is encountered in providing the proper antenna system. Interference from motor noises, and the ignition system must be suppressed or eliminated. The size of the car limits the length of the antenna, and at the same time provides a problem in concealing the same so there will be no unsightly appearance resulting from its installation, The antenna must also be installed so .that it will not ground on the frame of the car to which the auto storage battery is grounded, and which battery is also used as the A supply for the radio set.

An object of my invention is to provide a new and improved antenna.

It is a further object to provide a compact automobile radio receiver antenna which is simple to install, and presents no unsightliness to mar the appearance of the automobile in which it is mounted.

A further object is to provide an antenna which is groundproof.

A further object is to provide an antenna system of high capacity yet offering selectivity and volume, and

It is also an object to provide an antenna which is simple and inexpensive to manufacture, yet sturdy and permanent.

Other objects and advantages will appear as the description proceeds.

Referring now to the drawing,

Fig. 1 is a side elevation showing an embodiment of my invention as mounted underneath the chassis of an automobile and extending from axle to axle;

Fig. 2 is a fragmentary elevation, partly in section of the antenna of Fig. 1;

Fig. 3 is a sectional View along line 3-3 of Fig. 2;

Fig. 4 is an elevational View partly in section of another embodiment of the invention;

Fig. 5 is a sectional view along line 5--5 of Fig. 4; and

Fig. 6 is a perspective View partly in section of a further embodiment.

In accomplishing the invention, I provide a casing in which a strip of thin sheet metal is mounted, which casing is adapted to be mounted on the car, with a Wire lead extending from the sheet metal through the casing and to the radio set.

The antenna illustrated in Figs. 1 and 2 comedge. An insulated Wire 21 is soldered to the 65 metal strip 16 at 22 and when the strip is slipped into the pocket 17, the Wire is brought through a channel formed by the stitching 13 and 18 and out through an eyeleted hole 23. The eyelet is of a diameter such that it grips the insulation on the Wire and further seals the casing against moisture and foreign substances. The wire 21 connects the antenna to the radio set when the former is mounted on the car. After the strip 16 is in place in the casing, the ends are sewed up and cloth straps 23 and 24 are secured to the ends of the casing by riveting or, preferably, stitching, with said straps Waterproofed and adapted to be attached to the axles 26 and 27 of the car, to securely mount the antenna thereunder.

This particular embodiment provides a strong, waterproof casing for the antenna proper, which may be secured to the chassis of the car as stated, and require no further attention Whatever. The sturdy assembly insures against breaks or tears, thus assuring a ground-proof installation which is essential to the proper operation of the radio set, and is flexible so that there will be no cracking or breaking.

A further embodiment of the invention is illustrated in Figs. 4 and 5. This particular antenna assembly is also adapted for installation under an automobile and comprises a Water-proof fabricoid casing 41 stitched along the top at 42 and at the bottom at 43 to form a pocket 44. The edges are further reinforced and protected by a Waterproof tape 46 stitched around the edge after the pocket is completely closed. A metal strip 47 of thin copper sheet or cold-rolled steel is secured to a heavy piece of cardboard, or corrugated paper 48. This antenna proper is secured as noted by riveting, eyeleting or in any desirable manner. Inasmuch as the thin metal strip 47 is stiff and retains its shape, a very few eyelets 49 will be suiiicient to hold it in place on the paper. The metal strip 47 is from 1 to 2 inches in Width and is looped back and forth on the paper as illustrated in Fig. 4, to cover as large an area for reception of radio Waves as possible, and at the same time have the various loops separated from one another. The insulated wire 51 for connecting. the antenna with the radio set is soldered to the metal strip 47 at 52 looped through a hole in the cardboard 48 and, when the latter assembly is inserted in the pocket 44, the wire 51 extends out of the casing through an eyelet 53.

A second cardboard 54 out slightly larger than the mounting 48 slips snugly into the pocket 44 and is adapted to lie against the face of the antenna proper, serving as insulation and also tending to stiffen the entire assembly.

This particular embodiment is adapted to be suspended beneath a trunk carrier, or gas tank in the rear of the car, or beneath any part of the chassis as to allow it to swing free of the road. After the mounting 48 and paper 54 are in place in the pocket 44, the wire 53 is brought out as noted above, the end is stitched, and the tape 46 secured around the top edge and ends. A tape 55 is stitched along the lower edge in a manner so as to leave a channel 56 in which is placed rubber tubing 57. This tubing serves as a buier to protect the lower edge of the antenna should the automobile be driven over roads where the center is considerably higher than the tracks in which the wheels travel, and the antenna might drag along this center portion. Straps 58 are extended through eyelets 59 punched through both faces of the casing 41, and the paper 54 with said straps adapted for use in attaching the antenna beneath the car.

A further embodiment of the invention is illustrated in Fig. 6, in which a metal strip 61 similar to strip 47 is mounted in the same manner on a heavy cardboard 62. This embodiment is adapted particularly to be mounted on the inside of the roof of the car. The cardboard mounting is placed within a pocket formed by a cloth material 63 chosen to match the material on the roof of the car, which cloth 63 covers the face of the cardboard 62 opposite to that on which the strip 61 is mounted, laps over the edge of a second cardboard 64, and is secured thereto by gummed paper 66 or a similar expedient. After the mounting 62 is placed in the pocket, it is sealed along the four edges as described. Wire 6'7 is soldered to the strip 61 and extends through the mounting to be connected to the radio set.

The invention thus provides an antenna for an automobile radio receiver which in each instance is compact and designed to be securely mounted inside or outside of the automobile. The particular assembly also insures against grounding to the frame or body of the car, and provides a source of reception of radio waves for maximum operating eiliciency of the radio set. Furthermore, the simple assembly makes possible an inexpensive antenna, yet one with the desired permanency.

It will be understood that the nature and embodiments of the invention herein described and illustrated are merely convenient and useful forms of the invention, and that many changes and modifications may be made therein without departing from the spirit and scope of the invention.

What I claim as new and desire to protect by Letters Patent of the United States is:

1. As an article of manufacture, an antenna for mounting against the ceiling of a sedan type of automobile comprising a pocket formed of two sheets of insulating material one of which is of stiff material to form a self supporting backing, a wide metal conducting strip disposed back and forth across the face of one of said sheets and secured thereto to form a continuous loop inside the pocket, a cloth covering over one of said sheets and having a portion extending over the edge onto the other sheet, andmeans for securing the extending portion of the cloth to said other sheet.

2. As an article of `manufacturey an antenna for mounting against the ceiling of a sedan type of automobile comprising two stiff sheets of insulating material to form a self-supporting device, a wide metal conducting strip disposed back and forth across the face of one of the sheets in a plurality of loops to form a continuous conductor, means for securing said strip to said sheet, with said second sheet lying over the face of said strip as insulation therefor, a cloth covering over the outer face of one of the sheets with a portion extending over the edge of the rst sheet and onto the outer face of the `second sheet, and a gummed paper binder` to secure said extending portion to the outer face of the second sheet whereby to hold said cloth in position and retain said paper sheets in xed relationship.

PAUL L; MANN.

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